The chili peppers that you set your mouth on fire with may also lower your blood pressure.the chili peppers that set your mouth on fire … may also help lower blood pressure! chinese suresearchers found capsaicin — the compound that gives peppers their heat — helps blood vessels relax in rats with hypertension. researchers say human testing still needs to be done and it’s unclear how many chili peppers you’d have to eat to maintain low blood pressure. 3 3